I'm writing from the U.S. and have ventricular arrhythmia with sulfites. The point of this letter is to pass on another major source of sulfur poisoning. In the U.S. at least, the first major step in processing corn is to soak it in warm water for 48 hours to reconstitute it. To retard or eliminate bacteria growth in this process sulfur dioxide is added to the water. When the corn is processed into its hundreds of forms, this sulfur becomes concentrated and is a problem for sulfur intolerant folks like me. For twenty years I avoided commercial corn products totally, yet every year I would try my father-in-law’s organic sweet corn fresh from the farm and never had a reaction. Upon learning about the chemical contamination of processed corn, I began to experiment and it turned out that I can tolerate organically grown and processed corn but the commercial stuff is poison for me. – by email